#include <stdio.h>

int main()
{
    int a, b, c ;
    scanf("%d%d%d , &a,&b,&c");
    
    if (a <= 0 || b <= 0 || c <= 0)
    printf("invalid input");
    return 0;
}
    if(a == b && b == c)
{
     printf("eqilateral");
}
     else if(a == b || a == c || b == c)
{
     printf("isoscleses");
}
     else
{
    printf("scalene");
}
     return 0;
}